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Incidentally, June and July are not recommended in Japan because of the rainy season.
August in the middle of summer looks romantic events of fireworks, summer festival or so, but its just an illusion, and is also not recommended because of its high humidity and heat.
Winter is not a bad season except for the heavy snowfall on the Sea of Japan side. Just the daylight hours are somewhat shorter.
So relax at a ryokan with a natural hot spring and enjoy a hot pot Nabe dishs with a kotatsu.